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Related Concept Videos

Screw: Problem Solving01:21

Screw: Problem Solving

771
In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
771

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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
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Can we predict the insertion torque using the bone density around the implant?

M Wada1, T Suganami1, M Sogo2

  • 1Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University School of Dentistry, Osaka, Japan.

International Journal of Oral and Maxillofacial Surgery
|October 21, 2015
PubMed
Summary

This study found a strong correlation between bone density and initial implant stability in dental implant patients. Preoperative computed tomography (CT) scans can predict how stable dental implants will be upon insertion.

Keywords:
CT valueinsertion torqueprediction

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Area of Science:

  • Dentistry
  • Biomaterials Science
  • Medical Imaging

Background:

  • Achieving initial stability is crucial for successful dental implant osseointegration.
  • Bone density is a key factor influencing implant stability, but its direct correlation with insertion torque requires further investigation.
  • Preoperative assessment of bone quality is essential for predicting implant outcomes.

Purpose of the Study:

  • To investigate the correlation between bone density and initial stability of dental implants.
  • To evaluate the utility of multi-detector computed tomography (CT) in assessing bone density for implant placement.
  • To determine if preoperative CT imaging can predict initial implant stability.

Main Methods:

  • Twenty-five screw-type dental implants were placed in 12 patients.
  • Multi-detector computed tomography (CT) was used for preoperative bone density assessment (Hounsfield units, HU).
  • Insertion torque values (N·cm) were measured during implant placement; CT values around implants were correlated with torque using Spearman's rank correlation coefficient.

Main Results:

  • A strong positive correlation was observed between insertion torque values and mean CT values (bone density) for both 8-mm (r=0.699) and 10-mm (r=0.771) implants.
  • Mean CT values were 508.6 ± 187.0 HU for 8-mm implants and 579.6 ± 224.3 HU for 10-mm implants.
  • Mean insertion torque was 27.2 ± 12.1 N·cm for 8-mm implants and 28.1 ± 14.6 N·cm for 10-mm implants.

Conclusions:

  • Bone density, as measured by CT values, is a reliable indicator of initial implant stability.
  • Preoperative CT imaging can effectively predict the initial stability of dental implants.
  • This finding supports the use of CT scans in treatment planning for dental implantology to optimize patient outcomes.